Pump



.Sept 16, 1930. c. P. ElsENHAuER 1,776,113

PUMP

Filed Nov. 5. 1926 A TTORNEYS..

f Patented Sept. 16, 1930 UNITED STATES PATENTv OI-Flcl-z" CHARLES r. EISRNHAURR, or DAYTON, OHIO, AssIcfIvORv TO THR DURO ooMrAN-Y, OF I DAYTON, OHIO, A CORPORATION OR OHIO` u i.

i PUMP 4original application filed February a5, 192s, serial Nc. scese. Divided and this 'appiic'aaon filed November 3, 1926.

and .driving mechanism partially in section.v Referring to the drawing in detail, 1 1sl a common base for the .entire mechanism, the motor 2 being supported thereon'having an armature shaft 3. This armature shaft is bolted by the bolts 9 the pump housing 10. Access to the interior of this housing for lubrication purposes may be had through the aperture 11 closed bythe oil filling plug 12. vWithin lone part of this housing 10 is an actuating mechanism chamber 13.VV

The armature shaft 3 hasmounted on the` outer end thereof a cam sleeve 14 carrying a cam 15l which transverses the lmajor axis of the piston rods 16 and piston rod guides 17, the guides reciprocating in the apertures 6 within the bearing sleeves 7.`v

The piston rod on its inner endv is provided with ra sleeve 18 having a slot cut In one side as at'19 through which the cam 15 rotates and in doing so engages within the chamber 2O inside of the head 18 with a piston rod 21 with a spring pressed piston having a plunger rod 22 which is guided inthe forward end 23 of the piston rod guide, which is threaded within the head at 24 forming a cup within which seats thc spring 1 25 which engages the under side of the piston 21, thus insuring a constant yielding engagement of the piston rod 16 and its associated parts' with the actuating cam 15. 2O2L is a bearing` platelin the chamber 20 engaging the otherlsid'e of the cam.

It will be noted that the sleeve 14 is connected to the armature shaft 3 by a key 26 Y Vrods and pistons in succession;

and-a nut 27 on the cndiof Thus, the cam is detachable for replacement and repair. "The piston rod 16 is guided in its reciprocatory movement bythe 'sleeve 28 mounted within the tubular passageway 29 which is the maincylinder for the piston on the piston rod 16. [This piston consist-s of a pair of spaced washers 30, kcup-shapedin section with thei'rcups oppositely disposed, the rearcup engaging with the walls 31 of the cylinder, which are bounded oneither `side by the inlet passageway 32 of the suction line 33 and the'drain line '34. The forward cup engageswith the walls of the cylinder which are bounded on one sidev by the inlet suction line 32 and on the other vside by the outlet chamber 35 leading to the outlet or discharge line 36.

These cup-shaped washers are spacedA from one another bythe sleeve37 having the platelike shoulders 38 and 39, the latter being provided with passageways 40 whichy v are closed in one direction by the valve plate 41 which is loosely mounted on the screw 42 and retained in position by the head 43 thereof. l. f

The head of this screw projects in an exit passageway 35, the mouth of which isisealed by a discharge valve plate44 held in position normally by a spring 45 carrfcd on va leeve 46 threaded at 47 within the discharge ine. l

The rear washer 30`is embraced between the plate 38 andthe plate 48 which plate 48 engages a shoulder 49 on the piston rod 16.

The chamber 13 at its lower side carries lubricant 50 abovekthc drain plug `51. The pump casing is supported by the bi'aclret52 on the common basev` 1. A suction drain line 53 is provided which can be dra-inedby the Method of operai/oit As the electric motor rotates its arma- Y vture shaft, the cam 15 will rotate` and in doing so will reciprocate `the respective piston In doing so, as it drives thepistonl to the left hand,

the fluid behind the piston will passV through the openings 40 as the pressure of the fluid Y Will lift thevvalve plate 41. When the piston starts to return, the pressure of the confined fluid will Seat the valve plate ll and lift the valve plate 44 against the spring 45 discharging the fluid into the discharge line.

The apparatus is self lubricated and'takes up the Wear dueto its spring pressed engaging parts. i l

10 It Will be understood that I desire to comprehend within my invention such modiications as may be necessary to adapt it to varying conditions and uses. i

Having thus fully described my inven- 15 tion, what I claim as new and desire to se-v cure by Letters Patent, is:

In a piston rod, a rod carrying a piston at one end and a chambered portion at ythe other, having a lateral slot, a gui-de rod en- ,(-,.gaged in the rear end of .they chambered portion and bearing memberslcarried in said chambered portion spaced from` one another engaging the sides of an actuating cam projected through said slot and into said ohani- I Y. i Y j i E 'i' i hered portion, one of said hearingfmemhers having a guide rod adapted to reciprocate in the iirst mentioned guide rod and guided thereby, and yielding means for maintaining said member in engagement with said cam'.

30 In testimony whereof, I afiiX my signaf ture.. s v

lill" ufr o. r. nIsENrniUnR.-. y 1 

